User`s guide

507
Register S31 is used to set the speed and data format for the ASY port to which you are
currently connected.
The default value for ASY 0 is 0, i.e. the port speed/data format is not set to a specific
value, it is determined automatically from the AT commands that you enter.
The default value for ASY 1, 2 and 3 is 3, i.e. the ports will only accept AT commands at
115,200bps (8 data bits, no parity and 1 stop bit).
To set the speed of one of the ports to a particular value, the appropriate register should be
set to the required value from the following table:
S31
Port Speed (bps)
S31
Port Speed (bps)
0 Auto-detect 6 19200
1 Reserved 7 9600
2 Reserved 8 4800
3 115200 9 2400
4 57600 10 1200
5 38400 11 300
For example, to change the speed of ASY 1 to 38,400bps, connect your terminal to that port
with the speed set to 9600bps. Enter the command:
ats31=5
then change the speed of your terminal to 38,400bps before entering any more AT
commands.
The data format used when the ATS31=n command is entered is selected as the data
format for all further commands.
The auto-detect option is only available for ASY0 and ASY1.
S33 DTR Dialling
Units: N/A
Default: 0
Range: 0, 1
S33 is used to enable or disable DTR dialling for the port. When DTR dialling is enabled, the
unit will dial the number stored for that port (see AT&Z) when the DTR signal from the
terminal changes from Off to On.
S45 DTR Loss De-Bounce
Units: 0.05 seconds
Default: 5
Range: 1-255
The value in S45 determines the length of time for which the DTR signal from the terminal
device must go off before the unit acts upon any options that are set to trigger on loss of
DTR. Increasing or decreasing the value in S45 makes the unit less or more sensitive to
“bouncing” of the DTR signal respectively.